pentagon grounded entire fleet of f 35 fighter jets for the second time. inspectors discovered a cracked engine blade. last time the problem was a faulty fuel line. f 35 the pentagon most expensive weapons program and total estimated cost of nearly 400 billion dollars. justice department has joined a lawsuit against lance armstrong. suit alleges he concealed his use of per form answer enhancing drugs and defrauded his long time sponsor. u.s. postal service the federal government is joining the suit. >> fda today approved a new weapon in the fight against breast cancer. bay area company developed a drug. it's what doctors call a smart bottom target ago specific type of tumor and as jonathan explains it could be the first of new generation of cancer treatments. >>reporter: denise is a cancer researcher who encountered a crual twist of fate. >> diagnosed pretty soon after i started my graduate school studies in cancer biology. >>reporter: denise met cancer a type doctors consider incurrable. she under goes chemotherapy once a week and deals with the side effe